In this article, we study the following Klein-Gordon-Maxwell system involving critical exponent (KGM){-△u+V(x)u-(2w+Φ)Φu=λ|u|^q-2u+|u|^4u,x∈R^3,-△Φ+Φu^2
In this paper, we consider the following viscoelastic wave equation with delay|ut|ρutt-△u-△utt+∫0t g(t-8)△u(8)d8 + μ1 ut(x,t) + μ2 ut(x,t-τ) = b|u|p-2 u